Police released more surveillance photos on Thursday showing the suspect who they said stole from two shoppers in separate incidents this summer in Montgomery County.

The man, according to police, stole the elderly women’s wallets from their purses as they shopped and racked up roughly $12,000, buying a watch and high-end bike.

In the first case, police said, a 71-year-old woman was buying groceries July 21 at a store in Bethesda when she realized her wallet was missing from her purse. The thief bought a $5,000 blue “Santa Cruz” bicycle using one of the victim’s stolen credit cards.

The same man is believed to have also stolen the wallet on Aug. 12 of a 74-year-old woman as she was shopping at a store in the North Potomac area. The woman had left her purse and wallet in her cart and stepped away for a moment, police said. When she came back to her cart, the wallet was gone.

Police said the thief spent about $5,900, including $3,500 for a men’s watch, on one of the second woman’s stolen credit cards.

A surveillance photo shows a man wanted in the theft of a wallet in July at a store in Bethesda. (Courtesy of Montgomery County Police)

Authorities reminded residents to carry their wallet in a front pants pocket and to keep purses nearby. Shoppers also should be alert and aware of their surroundings when in stores, police said.

A reward of up to $10,000 is being offered. Anyone with information is asked to call 240-773-6070.